Thaum Lub Kaum Ob Hlis 23, ib pab pawg tshawb fawb los ntawm Department of Advanced Materials Engineering ntawm Pohang University of Technology tau tshaj tawm tias lawv tau tsim ib hom tshiab ntawm LED teeb uas tuaj yeem tso tawm lub teeb sib sib zog nqus ultraviolet raws li cov qauv sandwich ntawm graphene thiab hexagonal boron nitride (hBN) txheej. . Pab neeg tshawb fawb tau piav qhia tias txog tam sim no, cov khoom siv uas tso tawm cov duab sib sib zog nqus ultraviolet feem ntau yog siv cov khoom ua los ntawm mercury lossis aluminium gallium nitride, tab sis cov khoom siv niaj hnub no muaj teeb meem nrog kev ua qias tuaj lossis luminous efficiency. Cov txiaj ntsig kev tshawb fawb tsis ntev los no tau luam tawm nyob rau hauv lub ntiaj teb muaj koob npe kev kawm ntawv journal" Nature Communications".
▲ H-BN sib sib zog nqus ultraviolet LED. Daim duab schematic qhia tau hais tias kev siv graphene, h-BN thiab van der Waals heterogeneous nanomaterials nrog cov qauv graphene tuaj yeem emit muaj zog ultraviolet lub teeb (C)
Raws li Pohang University of Technology, cov khoom tseem ceeb tam sim no siv hauv kev tshawb fawb tob-ultraviolet LED yog aluminium gallium nitride (tom qab no hu ua AlxGa1-xN). Txawm li cas los xij, cov khoom siv no muaj qhov txwv yooj yim, uas yog, raws li lub wavelength ua luv luv, lub teeb-emitting yam ntxwv yuav deteriorate sai.
Txhawm rau rhuav tshem qhov kev txwv no, Pohang University of Technology siv h-BN ua cov khoom siv. Cov qauv ntawm nws ib txheej atomic zoo ib yam li graphene, thiab nws cov tsos yog pob tshab, yog li nws tseem hu ua" dawb graphene."
Nws tau tshaj tawm tias, tsis zoo li AlxGa1-xN, nws tawm lub teeb ci hauv thaj tsam ultraviolet tob thiab suav tias yog cov khoom siv tshiab uas tuaj yeem siv los tsim cov LEDs sib sib zog nqus ultraviolet. Txawm li cas los xij, vim qhov sib txawv ntawm qhov loj, nws nyuaj rau txhaj tshuaj electrons thiab qhov, ua rau nws tsis tuaj yeem ua rau LED. Txawm li cas los xij, yog tias qhov hluav taws xob muaj zog siv rau h-BN nano-film, cov hluav taws xob thiab qhov tuaj yeem raug txhaj los ntawm cov nyhuv tunneling. Yog li ntawd, cov khoom siv LED raws li Van der Waals heterogeneous nanomaterials stacked nrog graphene, h-BN thiab graphene tau fabricated, thiab sib sib zog nqus ultraviolet spectroscopy tau lees paub tias cov khoom siv tiag tiag emit muaj zog ultraviolet rays.
Xibfwb Jin Zhonghuan los ntawm Lub Tsev Haujlwm Saib Xyuas Kev Tshawb Fawb thiab Engineering ntawm lub tsev kawm ntawv tau hais tias: "Kev txhim kho cov khoom siv hluav taws xob ua haujlwm siab tshiab hauv cov kab hluav taws xob tshiab tuaj yeem yog qhov pib rau kev siv cov khoom siv kho qhov muag. Qhov tseem ceeb ntawm qhov kev tshawb fawb no ntawm h-BN yog nyob rau hauv kev ua tiav ntawm kev sib sib zog nqus-ultraviolet LED manufacturing. .
Tsis tas li ntawd, piv nrog cov khoom siv AlxGa1-xN uas twb muaj lawm, nws muaj qhov ua tau zoo dua luminous, thiab cov cuab yeej tuaj yeem ua rau me me."
